need help on this three part one
its about inelastic collisions momentum and energy related with work

Find the speed at which Superman (mass=76.0 kg) must fly into a train (mass = 17620 kg) traveling at 60.0 km/hr to stop it.

Running into the train at that speed would severely damage both train and passengers. Calculate the minimum time Superman must take to stop the train, if the passengers experience an average horizontal force of 0.430 their own weight.

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@elena - thank you so much help with the problem. i have trouble solving part b ...
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